Ventilating fan



June 14, 1 927Q S. A. XIPPAS VENTILATING FAN Original Filed Nov. 9. 1925 2 Sheew-Sheef- 1 attozmq June 14, 1927.

S. A. XIPPAS VENTILATING FAN Original Filed Nov. 9. 1925 2 Sheets-Sheet Socrafes Ian Reissued a... 14, 1927.

UNITED STATES PATENT OFFICE.

VENTILATING IAN.

Original Io. 1,577,280, dated. larch 16, 1926, Serial No. 87,787, filed November 9, 1925. Application for toluene and April as, 1927. Serial No. 186,132.

This invention relates to electric fans, and

' one object of my invention is to provide a i ll vertical electric fan, which is neat in appearance and durable in construction, and one which will effectively distribute and keep 1n circulation the air of a room.

Another object of'my inventionis to provide an electrlc fan which will properly distribute the air in a room, thus maintaimng an even temperature in a room'at all times, and at the same time preventing a strong blast of air beingdelivered in any direction.

Another object of my invention is to provide such an electric fan in which the air from the upper and lower parts of the room,

where the extreme temperatures prevail, are drawn into the fan and dlscharged through I the medial horizontal zone of the fan, thus maintaining the entire air contents of the room at an even temperature.

' correct ventilation in the breathing space of device;

. Fig. 3'is a top plan view of the rotary im-' peller;- p v Fi 4 is a front view of the rotary impeller;

.a room, that is, that space which Is between a persons head while standing, and a persons head while sitting.

Another object of my invention is to'provide such an electric fan with an air cooled motor, the air while being drawn into the fan casing, providing the means for cooling the motor.

Still another object of my invention is to provide such a fan that is noiseless in operation, and in which there is no gushing or violent blowing of air.

I accomplished the above and other objects of the invention which will be apparent as the descriptionproceeds, by means of the device shown in the accompanying drawings, in which: a

Fig. 1 is a perspective of the device;

Fig. 5 is a perspective detail view; and

Fig. 2 is a vertical central section of the Fig. 6 is a chart illustrating the efiiciency values of the blades ofthe rotary impeller at difierent angles.

r In the drawings, in which like reference characters indicate like parts on all the figures thereof, 1 indicates the, fan casing and 2 the motor casing, which also serves as the supporting stand for the fan casin and enclosed elements. The fan casing is gormed of two hemispherical parts 3, 3, each of which is provided with .two series of openings. One series of openings 4, 4 are arranged in the medial zone of the casing and the other series of openings 5, 5 are arranged in the polar zones of the casing. The openings 4:, 4

are of elongated form and extend for a greater vertical distance than the openings 5, 5, the purpose of which will be apparent as the description proceeds. v

Within the casing 1, is the rotary impeller or fan proper, which comprises the blades 6, each of which is substantially the shape of the'quadrant of a circle. A plate 7 is provided with four arms 8, substantially at Jright angles to each other, each arm having a flange 9 at one edge thereof to whichis attached a fan blade, two of the blades being disposed above the plate 7 and two below.

The opposed edges of the two upper blades are connected at their peripheral portions by means of an adjustable band comprising two strap elements 10, 10 having slotted ends through which is passed a set screw 11. The opposed edges of the two lower blades are similarly connected. This adjustable strap connection permits .of the blades being set at the desired angle with reference to the platel', and strengthens the structure thus preventing the parts being bent out of position during the continued operation of the Themotor casing 2 has cut out portions 12 at the bottom thereof, forming] entrance ports for the admission of air.

The blades may be set at any desired angle depending upon the velocity with whlch the fan'is to be operated. As examples of the relative pitch of the blades, and the relative velocity of operation required to admit and discharge the s'ameamount of air w thin a given period of time, the following table is given which sets-forth the actual results during tests 1. Discharge from fan per mmute in cubic feet,. at '1300 R. P. .M.'= 1120, pitch of blades 85.

2. Pitch of blades. Velocity.

An efliciency curve Afis shown in Figure 7 which charts the above results, the abscissas representing the pitch of the blades and the ordinates the velocity of operation. The area of the openings in the medlal zone is such that the amount of air drawn into the casing durin the operation .of the fan will be discharge over a largesurface. and in such a 'way that no vlolent blast will I i be produced, but merely a gentle breeze with a continual circulation of the surround-ing air.

As will be apparent by following the paths of the arrows on Fig. 2 of the draw: ings, air enteringthe entrance ports 12 .in the motor casing, is drawn upwardly around the motor, thus cooling the motor Air is also drawn into the fan casing directly from the roomthrough openings surrounding the connections between the fan andmotor casings. These two currents of r air are drawn along and follow the surface of the lower fan blades.

The air surrounding the upper part of the fan casing is drawn into the casing between the upper blades until it meets, and becomes commingled with the two currents entering the lower portion of the casing. Since the air entering the upper portion of the casing is of a different temperature from that entering the lower portion of the casing, this commingled action of the fan is of considerable V importance, since it serves to equalize the temperature of the air in the room. It is also to be noted that the air entering the lower portion of the fan vcasing directly from the room will be of a diiferent temperature from that entering it from the motor I casing. There are, therefore, three difierent stratas of air at different temperatures which 'meet and are commingled inthe fan casing.

The continuous movement of the fan blades then forces the thoroughly commingled air of. medium temperature outwardly along the fan blades and discharges it from the peripheries thereof in a tangential direction, through the openings in the medial zone of the casing.

It will be noted that the air will-be drawn into the casing in the angular space between the blades, and be expelled from the periphery of the blades so that there is no' tendency for the outgoing air to force the incoming air from its path as it enters the casing.

'From Figs. .2, 3 and 4 of the drawings, it may be seen that the blades 6 in rotating in a counter clockwise direction, will push or force the air currents from the top and bottom of the fan proper toward the plate 7, and the root portions of the blades will then deflect the intermingled air currents and gently move the same by centrifugal force, tangentially through the discharge zone of the fan casin Between the medial zone and the tw I polar zones, there are neutral zones, that is,

when the air which has been drawn into the casing reaches these zones,there is no tendency for it to continue on its upward or downward path, audit is therefore re-' tarded in its movement. This retarding action takes place just before the continuedmovement of the fan blades "forces it out The driving connection between the motor 'and the fan blade supporting plate 7 comprises a vertical shaft 21 which passes through a 'central'opening in the blade, and

is maintained in place b the lock nut '22.

What I claim and desireto secure by Letters Patent is: v

1. In a device of the class described, a retary impeller, and an enclosing casing therefor, said casing having a medial zone and two Solar zones of openings therein, said impe er including'means whereby the air is drawn into said casing through the openings in the polar zones and forced toward the medial zone, said means serving to discharge the air through the openings in the medial Zone.

' 2. In a device of the class described, a rotary impeller, a spherical enclosing casing therefor, said casing havinga medial zone of longitudinally extending openings therein for the discharge of air, and two polar zones of longitudinal openings for the admission of air, the area of the openings in the medial zone being relatively greater than III - two till the area. of the openings-in the polar zone whereby the air will be discharged over a large area with reduced force.

3. In a device of the class described, a

spherical casing, said casing having two polar zones provided w th openings for the admission of air, said casing being also provided with a medial zone of openings for-the discharge of air, and a rotary impeller located Within said casing, said impeller comprising a plurality of bladesconsisting of setsof upper and lower blades, said blades being disposed at substantially right angles to each other, and in planes at an "angle to the central vertical plane passing through the attached to other of said arms, the pitch of each blade being substantially 85 relatively to said arms. a

v6. In a rotary impeller, a rotatably mounted support, a series of horizontal arms on said support at right an les at each other, an inclined blade on eac arm,and means for joining diametrically opposed blades to each other near their outer edges. I

' 7. In a device of the class described, a rotary impeller, an enclosing easing therefor, said casing having a medial zone and polar zones of openings therein, said impe ler comprising a rotatably mounted support, separate upper and lower blades on said support, all of said blades being inclined to the vertical.

8. In a device of the class described, a 'rotary impeller, an enclosing casing therefor;

said casing having two po r zones of openings therein for the admission of air, and a medial zone of openings for the dischar e of air, said impeller comprising a rotatab y mounted support, horizontal arms on said support, upper blades attached to certain of said arms, and lower blades attached to other of said arms, said blades being at right angles ,to each other, and all of said blades being inclined to the vertical.

9. In a device of the class described, a retary impeller, an enclosing casing therefor,

provided with top and bottom air admission ports and with intermediate exhaust ports, a motor for operating said impeller, a casing first named casing for .said motor, said first named casing being supported u on said second named casing, said secon named casing having an air entrance port in the lower portion thereoffland being in communication withthe at the top of the motor casing, and said impeller having blades arranged to force streams of air from the ends of the impeller toward the medial portion of the same, to intermingle said streams and to discharge the ports.

10. rotary impeller, a casing therefor,-said casing having air inlet ports in the upper and lower portions thereof, and air exit ports in the medial portions thereof, said impeller including means whereby the air admitted throu h-the upper and lower ports will be comrmngled and discharged, through the exit ports.

11. In a device of the class described, a 1'0- tary impeller, a casing therefor, a hollow support'for said casing means for admitting air into the support, means for admitting air into the upper and lower rtions of the casing, and means for admittmg air into the casing frornthe su port, said impeller,

including means where y the air admittedinto the casing willbecommingled and, discharged through the medialportion of the casing. i.

12. In a device of the class described, a rotary impeller, a casin therefor, means for admitting air intosaid casing at opposite points, means for discharging air from said casingat intermediate POlIltS said impeller comprising a plurality of blades arranged to force streams of air from the air admitting means toward the intermediate portion of the impeller, to intermingle said streams and todischarge the same through the discharging means.

13. In ii device of the class described, a,

an openwork' casin thererotary impeller, for, said im eller comprising a plurality of upper bla es at an angle to each other, a plurality of lower blades at an angle to each other, all of said blades being inclined relativel to the vertical, 'said'blades being arrange to draw air into the casing at points in the angles between the blades, to force said air towardth'e intermediate portion of the impeller {and toidischarge the same along the .periphery'of the blades.

14. In a device of the class described, a rotary shaft, and an'impeller-on said shaft comprising blades having portions adapted to force air axially from the ends of the impeller toward the medial I portion of the same, the portions of the blades at the medial part of the impeller being shaped to mix the air from the opposite ends of the impeller, and to force the air away from said shaft.

same through said exhaust In a device of .the'class described, a

15. In a device of the class described, a impeller, the portions of the blades at the vertical rotary shaft, and an lIl'l eller mountmedial part of the impeller bein shaped to ml on and rotatable With sai shaft, said mix the air from the'ends of the lades, and 10 impeller comprising axially extending oppoe to discharge the same horizontally under I sitely projecting blades having portions centrifugal force.

ada ted to force air from the ends vof the bla es, toward the medial portion of the SOCRATES ANTHONY XIPPAS. 

